This book is the result of the workshop "Deception, Fraud, and Trust in Agent Societies," held in Barcelona on June 4, 2000 as part of the Autonomous Agents 2000 Conference, and organized by Rino Falcone, Munindar Singh, and Yao-Hua Tan. The aim of the workshop was to bring together researchers from di?- ent ?elds (Arti?cial Intelligence, Multi-Agent Systems, Cognitive Science, Game Theory, and Social and Organizational Sciences) that could contribute to a b- ter understanding of trust and deception in agent societies. The workshop scope included theoretical results as well as their...